Group Companies - Additional Information - Associates (Detail) € in Millions	12 Months Ended
Dec. 31, 2025 EUR (€)
Disclosure of associates [Line Items]
Period over which directors may be appointed	5 years
La Banque Postale Asset Management (LBPAM) [member] \| Asset Management [member]
Disclosure of associates [Line Items]
Proportion of ownership interest in associate	25.00%
Name of associate	La Banque Postale Asset Management
Country of incorporation of associate	France
A.S.R. Nederland N.V [Member]
Disclosure of associates [Line Items]
Percentage of shareholding above which unanimous vote of the supervisory directors is required for capital management material reinsurance and capital allocation	20.00%
Merger and acquisition transactions above which affirmative vote of independent nominee is required	€ 500
A.S.R. Nederland N.V [Member] \| Bottom of range [member]
Disclosure of associates [Line Items]
Percentage of shareholding for where vote of the non independent nominee is required for changes to dividend policy	20.00%
A.S.R. Nederland N.V [Member] \| Criteria Two For Directors Appointment [Member] \| Top of range [member]
Disclosure of associates [Line Items]
Percentage of shareholding for director appointment	20.00%
A.S.R. Nederland N.V [Member] \| Criteria Two For Directors Appointment [Member] \| Bottom of range [member]
Disclosure of associates [Line Items]
Percentage of shareholding for director appointment	10.00%
A.S.R. Nederland N.V [Member] \| Criteria One For Directors Appointment [Member] \| Bottom of range [member]
Disclosure of associates [Line Items]
Percentage of shareholding for director appointment	20.00%
A.S.R. Nederland N.V [Member] \| Holding [Member]
Disclosure of associates [Line Items]
Proportion of ownership interest in associate	24.12%
Name of associate	ASR Nederland N.V
Principal place of business of associate	Utrecht
Americas [member] \| Dawn Holdings LLC, Wilmington [Member]
Disclosure of associates [Line Items]
Proportion of ownership interest in associate	19.99%
Name of associate	Dawn Holdings LLC, Wilmington
Principal place of business of associate	United States

Merger and acquisition transactions above which affirmative vote of independent nominee is required.

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- Definition

Percentage of shareholding above which unanimous vote of the supervisory directors is required for capital management material reinsurance and capital allocation.

+ References

No definition available.

+ Details

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- Definition

Percentage of shareholding for director appointment.

+ References

No definition available.

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- Definition

Percentage of shareholding for where vote of the non independent nominee is required for changes to dividend policy.

+ References

No definition available.

+ Details

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- Definition

Period over which directors may be appointed.

+ References

No definition available.

+ Details

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- Definition

The country in which an associate of the entity is incorporated. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2025-03-27

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The name of an associate. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2025-03-27

+ Details

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- Definition

The principal place of business of an associate. [Refer: Principal place of business; Total for all associates [member]]

+ References

+ Details

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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 27
-IssueDate 2025-01-01
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